<?php

/**
 * Filter by whether the node is the original translation.
 */
class views_handler_filter_node_tnid extends views_handler_filter {

    function admin_summary() {
        
    }

    function option_definition() {
        $options = parent::option_definition();

        $options['operator']['default'] = 1;

        return $options;
    }

    /**
     * Provide simple boolean operator
     */
    function operator_form(&$form, &$form_state) {
        $form['operator'] = array(
            '#type' => 'radios',
            '#title' => t('Include untranslated nodes'),
            '#default_value' => $this->operator,
            '#options' => array(
                1 => t('Yes'),
                0 => t('No'),
            ),
        );
    }

    function can_expose() {
        return FALSE;
    }

    function query() {
        $table = $this->ensure_my_table();
        // Select for source translations (tnid = nid). Conditionally, also accept either untranslated nodes (tnid = 0).
        $this->query->add_where($this->options['group'], "$table.tnid = $table.nid" . ($this->operator ? " OR $table.tnid = 0" : ''));
    }

}

